/* 12.27 TCP MUST ignore MSS option in data segment When using TCP over IPv6, 
   the MSS must be computed as the maximum packet size minus 60 octets.  */

/* Procedure
   1. Client connect with Server.
   2. Client sends a packet containing MSS options to Server.
   3. Judge the packet.  */

#include    "tx_api.h"
#include    "nx_api.h"
#include    "nx_tcp.h"
#include    "nx_ip.h"
#include    <time.h> 

extern void    test_control_return(UINT status);

#if defined(__PRODUCT_NETXDUO__) && defined(FEATURE_NX_IPV6)
#include    "nx_ipv6.h"

#define     DEMO_STACK_SIZE    2048


/* Define the ThreadX and NetX object control blocks...  */

static TX_THREAD               ntest_0;
static TX_THREAD               ntest_1;

static NX_PACKET_POOL          pool_0;
static NX_IP                   ip_0;
static NX_IP                   ip_1;
static NX_TCP_SOCKET           client_socket;
static NX_TCP_SOCKET           server_socket;

/* Define the counters used in the demo application...  */

static ULONG                   error_counter;
static ULONG                   data_counter;
static UCHAR                   data_12_27[20];
static ULONG                   mss_option_12_27;

static NXD_ADDRESS                    ipv6_address_1;
static NXD_ADDRESS                    ipv6_address_2;

/* Define thread prototypes.  */

static void    ntest_0_entry(ULONG thread_input);
static void    ntest_0_connect_received(NX_TCP_SOCKET *server_socket, UINT port);
static void    ntest_0_disconnect_received(NX_TCP_SOCKET *server_socket);
static void    ntest_1_entry(ULONG thread_input);
extern void    _nx_ram_network_driver_1500(struct NX_IP_DRIVER_STRUCT *driver_req);
static void    my_tcp_packet_receive_12_27(NX_IP *ip_ptr, NX_PACKET *packet_ptr);
extern UINT    (*advanced_packet_process_callback)(NX_IP *ip_ptr, NX_PACKET *packet_ptr, UINT *operation_ptr, UINT *delay_ptr);
static UINT    my_packet_process_12_27(NX_IP *ip_ptr, NX_PACKET *packet_ptr, UINT *operation_ptr, UINT *delay_ptr);


/* Define what the initial system looks like.  */

#ifdef CTEST
VOID test_application_define(void *first_unused_memory)
#else
void           netx_12_27_application_define(void *first_unused_memory)
#endif
{
CHAR       *pointer;
UINT       status;

    /* Setup the working pointer.  */
    pointer = (CHAR *) first_unused_memory;

    error_counter = 0;
    data_counter = 0;
    mss_option_12_27 = 20;

    /* Create the main thread.  */
    tx_thread_create(&ntest_0, "thread 1", ntest_0_entry, 0,  
                     pointer, DEMO_STACK_SIZE, 
                     3, 3, TX_NO_TIME_SLICE, TX_AUTO_START);

    pointer = pointer + DEMO_STACK_SIZE;

    /* Create the main thread.  */
    tx_thread_create(&ntest_1, "thread 0", ntest_1_entry, 0,  
                     pointer, DEMO_STACK_SIZE, 
                     4, 4, TX_NO_TIME_SLICE, TX_AUTO_START);

    pointer = pointer + DEMO_STACK_SIZE;



    /* Initialize the NetX system.  */
    nx_system_initialize();

    /* Create a packet pool.  */
    status = nx_packet_pool_create(&pool_0, "NetX Main Packet Pool", 1536, pointer, 1536*16);
    pointer = pointer + 1536*16;

    if(status)
        error_counter++;



    /* Create another IP instance.  */
    status = nx_ip_create(&ip_0, "NetX IP Instance 0", IP_ADDRESS(1,2,3,5), 0xFFFFFF00UL, &pool_0, _nx_ram_network_driver_1500,
                          pointer, 2048, 1);
    pointer = pointer + 2048;
    
    /* Create an IP instance.  */
    status += nx_ip_create(&ip_1, "NetX IP Instance 1", IP_ADDRESS(1,2,3,4), 0xFFFFFF00UL, &pool_0, _nx_ram_network_driver_1500,
                           pointer, 2048, 1);
    pointer = pointer + 2048;

    if(status)
        error_counter++;

    /* Set ipv6 version and address.  */
    ipv6_address_1.nxd_ip_version = NX_IP_VERSION_V6;
    ipv6_address_1.nxd_ip_address.v6[0] = 0x20010000;
    ipv6_address_1.nxd_ip_address.v6[1] = 0x00000000;
    ipv6_address_1.nxd_ip_address.v6[2] = 0x00000000;
    ipv6_address_1.nxd_ip_address.v6[3] = 0x10000001;

    ipv6_address_2.nxd_ip_version = NX_IP_VERSION_V6;
    ipv6_address_2.nxd_ip_address.v6[0] = 0x20010000;
    ipv6_address_2.nxd_ip_address.v6[1] = 0x00000000;
    ipv6_address_2.nxd_ip_address.v6[2] = 0x00000000;
    ipv6_address_2.nxd_ip_address.v6[3] = 0x10000002;

    status = nxd_ipv6_address_set(&ip_1, 0, &ipv6_address_1,64, NX_NULL);
    status += nxd_ipv6_address_set(&ip_0, 0, &ipv6_address_2,64, NX_NULL);

    if(status)
        error_counter++;

    /* Enable IPv6 */
    status = nxd_ipv6_enable(&ip_0);
    status += nxd_ipv6_enable(&ip_1);

    if(status)
        error_counter++;

    /* Enable ICMP for IP Instance 0 and 1.  */
    status = nxd_icmp_enable(&ip_0);
    status += nxd_icmp_enable(&ip_1);

    /* Check ARP enable status.  */
    if(status)
        error_counter++;

    /* Enable TCP processing for both IP instances.  */
    status = nx_tcp_enable(&ip_0);
    status += nx_tcp_enable(&ip_1);

    /* Check TCP enable status.  */
    if(status)
        error_counter++;
}


static void    ntest_0_entry(ULONG thread_input)
{
UINT       status;
ULONG      actual_status;
NX_PACKET  *my_packet;



    /* Ensure the IP instance has been initialized.  */
    status = nx_ip_status_check(&ip_0, NX_IP_INITIALIZE_DONE, &actual_status, NX_IP_PERIODIC_RATE);

    /* Check for earlier error.  */
    if(error_counter)
    {
        printf("ERROR!\n");
        test_control_return(1);
    }


    /* Create a socket.  */
    status = nx_tcp_socket_create(&ip_0, &server_socket, "Server Socket", 
                                  NX_PROTOCOL_NEXT_HEADER_HOP_BY_HOP, NX_FRAGMENT_OKAY, NX_IP_TIME_TO_LIVE, 200,
                                  NX_NULL, ntest_0_disconnect_received);

    /* Check for error.  */
    if(status)
        error_counter++;

    /* Setup this thread to listen.  */
    status = nx_tcp_server_socket_listen(&ip_0, 12, &server_socket, 5, ntest_0_connect_received);

    /* Check for error.  */
    if(status)
        error_counter++;

    /* Accept a client socket connection.  */
    status = nx_tcp_server_socket_accept(&server_socket, NX_IP_PERIODIC_RATE);

    if(status)
        error_counter++;


    ip_0.nx_ip_tcp_packet_receive = my_tcp_packet_receive_12_27;
    status = nx_tcp_socket_receive(&server_socket,&my_packet, NX_IP_PERIODIC_RATE);

    /* Check for error.  */
    if(status)
        error_counter++;
    else
    {
        /* Check data length and payload */
        if((my_packet -> nx_packet_length == 20) && (!memcmp(my_packet -> nx_packet_prepend_ptr, data_12_27, 20)))
            data_counter++;

        /* Release the packet.  */
        nx_packet_release(my_packet);
    }


    /* Check whether the server ignore the MSS options.  */
    if(server_socket.nx_tcp_socket_connect_mss == mss_option_12_27)
        error_counter++;

    /* Disconnect the server socket.  */
    status = nx_tcp_socket_disconnect(&server_socket, NX_IP_PERIODIC_RATE);

    /* Check for error.  */
    if (status)
        error_counter++;

    /* Unaccept the server socket.  */
    status = nx_tcp_server_socket_unaccept(&server_socket);

    /* Check for error.  */
    if (status)
        error_counter++;

    /* Unlisten on the server port.  */
    status =  nx_tcp_server_socket_unlisten(&ip_0, 12);

    /* Check for error.  */
    if (status)
        error_counter++;

    /* Delete the socket.  */
    status = nx_tcp_socket_delete(&server_socket);

    /* Check for error.  */
    if(status)
        error_counter++;


}


/* Define the test threads.  */

static void    ntest_1_entry(ULONG thread_input)
{
UINT       status;


    /* Print out test information banner.  */
    printf("NetX Test:   TCP Spec 12.27 Test.......................................");


    /* Create a socket.  */
    status = nx_tcp_socket_create(&ip_1, &client_socket, "Client Socket", 
                                  NX_PROTOCOL_NEXT_HEADER_HOP_BY_HOP, NX_FRAGMENT_OKAY, NX_IP_TIME_TO_LIVE, 300,
                                  NX_NULL, NX_NULL);

    /* Check for error.  */
    if(status)
        error_counter++;

    /* Bind the socket.  */
    status = nx_tcp_client_socket_bind(&client_socket, 12, NX_IP_PERIODIC_RATE);

    /* Check for error.  */
    if(status)
        error_counter++;

    /* Call connect to send a SYN.  */ 
    status = nxd_tcp_client_socket_connect(&client_socket, &ipv6_address_2, 12, 5 * NX_IP_PERIODIC_RATE);

    /* Check for error.  */
    if(status)
        error_counter++;

    advanced_packet_process_callback = my_packet_process_12_27;
    _nx_tcp_packet_send_syn(&client_socket,client_socket.nx_tcp_socket_tx_sequence );


    /* Disconnect this socket.  */
    status = nx_tcp_socket_disconnect(&client_socket, NX_IP_PERIODIC_RATE);
    if(status)
        error_counter++;

    /* Unbind the socket.  */
    status = nx_tcp_client_socket_unbind(&client_socket);
    if(status)
        error_counter++;

    /* Delete the socket.  */
    status = nx_tcp_socket_delete(&client_socket);

    /* Check for error.  */
    if(status)
        error_counter++;

    /* Check for error.  */
    if((error_counter != 0) || (data_counter != 2))
    {
        printf("ERROR!\n");
        test_control_return(1);
    }
    else
    {
        printf("SUCCESS!\n");
        test_control_return(0);
    }

}



static void rand_12_27()
{
UINT       flag;
UINT       j,k=0;

    srand((unsigned)time(NULL)); 
    for(j=0;j<20;j++)
    {
        flag=rand()%2; 
        if(flag) data_12_27[k++]='A'+rand()%26;
        else data_12_27[k++]='a'+rand()%26;
    }
}

static UINT    my_packet_process_12_27(NX_IP *ip_ptr, NX_PACKET *packet_ptr, UINT *operation_ptr, UINT *delay_ptr)
{

NX_TCP_HEADER          *tcp_header_ptr;
ULONG                  *option_word_1;
ULONG                  checksum;
NX_IPV6_HEADER         *ip_header_ptr;
ULONG                  *source_ip, *dest_ip;
ULONG                  mss;
ULONG                  option_words;

    /*Create a data seg with mss option*/

    ip_header_ptr = (NX_IPV6_HEADER*)(packet_ptr -> nx_packet_prepend_ptr);
    tcp_header_ptr = (NX_TCP_HEADER *)(packet_ptr -> nx_packet_prepend_ptr + 40);
    option_word_1 = (ULONG *)(tcp_header_ptr + 1);
    NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_header_word_3);
    
    /* Construct a data segment with mss option based on the SYN packet*/
    if((tcp_header_ptr -> nx_tcp_header_word_3 & NX_TCP_SYN_BIT) && !(tcp_header_ptr -> nx_tcp_header_word_3 & NX_TCP_RST_BIT))
    {
        /*Get the option kind*/
        option_words =  (tcp_header_ptr -> nx_tcp_header_word_3 >> 28) - 5;
                       
        /*Get the MSS option form the SYN packet.*/
        _nx_tcp_mss_option_get((packet_ptr -> nx_packet_prepend_ptr + sizeof(NX_TCP_HEADER) + sizeof(NX_IPV6_HEADER)), option_words*sizeof(ULONG), &mss);

        /*The MSS must be com-puted as the maximum packet size minus 60 octets.*/
        if( mss != 1440)
            error_counter++;

        /*Delete the SYN bit.*/
        tcp_header_ptr -> nx_tcp_header_word_3 = tcp_header_ptr -> nx_tcp_header_word_3 ^ NX_TCP_SYN_BIT;
        NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_header_word_3);

        NX_CHANGE_ULONG_ENDIAN(*option_word_1);

        /*Modify the MSS option value to 20*/
        *option_word_1 = *option_word_1 & 0xFFFF0000;
        *option_word_1 = *option_word_1 | 0x00000014;
        NX_CHANGE_ULONG_ENDIAN(*option_word_1);

        rand_12_27();
        nx_packet_data_append(packet_ptr, data_12_27, 20, &pool_0, NX_IP_PERIODIC_RATE);

        /*Modify the payload length of the IPv6 header.*/
        NX_CHANGE_ULONG_ENDIAN(ip_header_ptr->nx_ip_header_word_1);
        ip_header_ptr->nx_ip_header_word_1 = ip_header_ptr->nx_ip_header_word_1 & 0x0000FFFF;
        ip_header_ptr->nx_ip_header_word_1 = ip_header_ptr->nx_ip_header_word_1 | 0x00300000;
        NX_CHANGE_ULONG_ENDIAN(ip_header_ptr->nx_ip_header_word_1);




        packet_ptr -> nx_packet_prepend_ptr += sizeof(NX_IPV6_HEADER);
        packet_ptr -> nx_packet_length -= sizeof(NX_IPV6_HEADER);


        tcp_header_ptr -> nx_tcp_header_word_4 = 0;


        dest_ip = client_socket.nx_tcp_socket_connect_ip.nxd_ip_address.v6;
        source_ip = client_socket.nx_tcp_socket_ipv6_addr -> nxd_ipv6_address;

        checksum = _nx_ip_checksum_compute(packet_ptr, NX_PROTOCOL_TCP,
                                           packet_ptr->nx_packet_length,
                                           source_ip, dest_ip);
        checksum = ~checksum & NX_LOWER_16_MASK;


        /* Move the checksum into header.  */
        NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_header_word_4);
        tcp_header_ptr -> nx_tcp_header_word_4 = (checksum << NX_SHIFT_BY_16);
        NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_header_word_4);

        packet_ptr -> nx_packet_prepend_ptr -= sizeof(NX_IPV6_HEADER);
        packet_ptr -> nx_packet_length += sizeof(NX_IPV6_HEADER);
        
        /* Modify the new sequence of client socket. */
        client_socket.nx_tcp_socket_tx_sequence += 20;

        advanced_packet_process_callback = NX_NULL;
    }
    else
        NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_header_word_3);


    return NX_TRUE;
}


static void   my_tcp_packet_receive_12_27(NX_IP *ip_ptr, NX_PACKET *packet_ptr)
{
NX_TCP_HEADER  *tcp_header_ptr;
ULONG          option_words;
ULONG          mss;

    tcp_header_ptr = (NX_TCP_HEADER *)packet_ptr -> nx_packet_prepend_ptr;

    /*Check if both the sockets are in ESTABLISHED state*/
    if(server_socket.nx_tcp_socket_state == NX_TCP_ESTABLISHED)
    {
        /*Get the option kind*/
        option_words =  (tcp_header_ptr -> nx_tcp_header_word_3 >> 28) - 5;

        /*Get the MSS option form the SYN packet.*/
        _nx_tcp_mss_option_get((packet_ptr -> nx_packet_prepend_ptr + sizeof(NX_TCP_HEADER)), option_words*sizeof(ULONG), &mss);

        if(mss == mss_option_12_27)
            data_counter++;

        /* Point to default function   */
        ip_0.nx_ip_tcp_packet_receive = _nx_tcp_packet_receive;
    }

    /* Deal with default function   */
    _nx_tcp_packet_receive(ip_ptr, packet_ptr);
}




static void    ntest_0_connect_received(NX_TCP_SOCKET *socket_ptr, UINT port)
{

    /* Check for the proper socket and port.  */
    if((socket_ptr != &server_socket) || (port != 12))
        error_counter++;
}

static void    ntest_0_disconnect_received(NX_TCP_SOCKET *socket)
{

    /* Check for proper disconnected socket.  */
    if(socket != &server_socket)
        error_counter++;
}

#else

#ifdef CTEST
VOID test_application_define(void *first_unused_memory)
#else
void    netx_12_27_application_define(void *first_unused_memory)
#endif
{

    /* Print out test information banner.  */
    printf("NetX Test:   TCP Spec 12.27 Test.......................................N/A\n");
    test_control_return(3);

}
#endif
